Electronics for Kids: Play with Simple Circuits and Experiment with Electricity

Electronics for Kids: Play with Simple Circuits and Experiment with Electricity — page 7
How to Use an LED Correctly 76 How to Write Small Values 77 Protecting Your LED with a Resistor 77 Calculating the Resistance You Need 78 Project 8 Powering an LED 78 Shopping List 79 Step 1 Twist the Resistor and LED 79 Step 2 Wire the Battery Clip 80 Step 3 Let There Be Light 80 Step 4 What If the LED Doesn’t Work 81 Building Circuits on a Breadboard 81 How to Connect Components and Wires 81 Wires to Use on a Breadboard 83 Project 9 Your First Breadboard Circuit 84 Shopping List 84 Step 1 Place the Resistor 85 Step 2 Place the LED 85 Step 3 Place the Battery Clip 86 Step 4 What If the LED Doesn’t Work 87 What’s Next 87 5 Blinking a Light for the First Time 89 Meet the Capacitor 90 How Capacitors Work 90 Polarized and Nonpolarized Capacitors 91 Capacitor Values 92 Project 10 Test a Capacitor 92 Shopping List 93 Step 1 Start with the LED Circuit 94 Step 2 Add the Capacitor 94 Step 3 Charge the Capacitor 95 Step 4 Use the Capacitor to Light the LED 95 Step 5 What If the Circuit Doesn’t Work 95 Describing Circuits with Symbols 95 Meet the Relay 97 Using the Relay to Blink a Light 99 Slowing Down the Blinking 100 Project 11 Blink a Light 101 Shopping List 102 Step 1 Identify the Relay Pins 103 Step 2 Make the Relay Switch Fast 104 xii CONTENTS IN DETAIL